Drawing mechanism



June 17, 1930. c BUTLER 1,765,@5@

DRAWING MECHANI SM Filed Aug. 22 1928 Patented June 17, 1930 v UNITED STATES PATENT OFFICE DRAWING MECHANISM Application filed August 22, 1928. Serial No. 801,282.

This invention relates to mechanism for drafting or drawing rovings, slivers and the like, more efficiently than is possible with the apparatus heretofore employed and. to

effect an unusually long draft under a high degree of control so that the uahty of the product does not sufl'er due to t e long draft.

The present invention is particularly applicable where the drawing of the sliver 1s accomplished by two successive operations in the same drawing frame, means being provided to control the first drawing, to prevent undue spreading of the shver after the first drawing, and to control the second drawing so that only those fibers are drafted which are actually caught in the nip of the drawing rollers. For condensing the sliver after the first draft and controlling the second draft, I preferably employ a single member in the form of a cap piece which rests on one of the lower draw rollers, this invention relating more particularly to this member and its mounting and its arrangement relative to the drafting rollers.

For a more complete understanding of the invention, reference is had to the following description thereof, and to the drawing, of which,-

Figure 1 is a side elevation of a roller 3 stand carrying an embodiment of the invention.

Figure 2 is a fragmentary plan view of the drawing mechanism.

Figure 3 is a perspective view of a draft cap.

Figures 4:, 5 and 6 are side elevations of a roller stand showing different means for holding the cap in place.

Referring to the drawin in detail, 10 represents a roller stand for a drawing mechanism. This stand is preferably constructed with a rearwardly extending arm 11 on which is adjustably secured a block 12. The drawing rollers carried on the stand 10 comprise front rollers 13, 14:, intermediate or middle rollers 15, 16, rear rollers 17, 18, and an additional intermediate drawing roller 19 which is preferably between the front and middle rollers and 50 between which and the roller 16 the upper middle roller 15 rides. This roller is preferably kept in place laterally by the wei ht hook 35 (Figure 1) or the saddle 40 i ure 4). The roller 19 and the lower midd e and rear rollers 16 and 18 are journaled directly in the block 12. The lower front roller 14 is journaled directly in the roller stand 10. The upper front and rear rollers 13, 17 rest on the corresponding lower rollers and are vertically movable in guideways or nebs 20, 21, respectively, formed in or attached to cap bars 22 which are pivoted as at 23 to the block 12. The block 12 is adjustable on the rearwardly extending arm 11 and may Adjustment of the block 12 varies the distance between the intermediate rollers and the nip of the front rollers, but does not alter the distance between the intermediate rollers and the nip of the rear rollers. In order to secure better control of the drawing operation and to obtain a longer draft between the rear and intermediate rollers, I may provide a draft or drawing bar 26 having slots 27 therein through which the rovings or slivers pass. This draft bar is adjustably located at a distance from the nip of the intermediate rollers 15, 16 about equal to the average length of the fibers in the roving or sliver. The frictional engagement of the sliver or roving with the side walls of the slot 27 also compacts or compresses it slightly at that point, thus holding it in tact so that only those fibers which are positively gripped in the nip by the intermediate rollers are drawn. By using this draft bar, it is unnecessary to adjust the distance between the nip of the intermediate rollers and that of the rear rollers. This draft bar and its mounting are not per se apart of this invention, but are more fully described and claimed in my Patent No. 1,586,605,- granted June 1, 1926.

According to the present invention, I obtain a second drawing operation which is also readily controlled and which permits com aratively long drawing. The second dra t is between the front rollers 13, 14: and the engaging surfaces of the roller 19 and a drag cap 28 resting on the roller 19. 1

be fixed in position thereon. I

The cap 28 ma be constructed as shown in Fi re 3 wit a heavy lateral rib 29 to ive 1t wei ht to increase its retarding or rawing e ect. The under surface of the cap 28 1s hollowed as at 30 to fit snugl on a portion of the peripheral surface 0 the drag roller 19, and 1s also formed with plate-like extensions or aprons 31 which extend forwardly and downwardly their under surfaces extending substantially tangentiall to the curvature of the surfaces 30. Eac apron 31 is preferably slotted as at 32, the slots acting as guides through which the rovings pass to prevent undue s reading thereof and the traversing mot1on of the roving passing through these slots acts to impart similar motion to the cap. The rearward portion of the ca 28 is preferably shaped to form a blunt ge 33 adapted to extend well in toward the nip of the rollers 15, 19. The ca however, is preferably adjusted so as to be out of actual contact with the roller 15.

In order to maintain the cap 28 in its desired position on top of the roller 19, I ma form a hook or finger 34 on a weight hoo 35 which may engage over the roller 15 and may be weighted or spring-pressed so as to brin substantial pressure on the roller 15. As s own in Figure 1, the weight hook 35 may extend downwardly and may be engaged by a suitable leaf spring 36, which in turn is secured to a laterally extending bar 37, and may be adjusted to desired tension as by a nut 38 mounted on a screw39, which projects downwardly from the bar 37 and through a suitableslot in the spring 36. The finger 34 is shaped to pass under the rib-29 between the aprons 31'and to engage the front face of the rib. Since'the hook 35 is always definitely laced with relation to the roller 15, the ger 34 when once suitably shaped will maintain the cap 28 on the roller 19 in correctrelation to the roller 15.

The method of weighting the middle top rollers as shown in Flgure 1 by springs attached to a bar fixed to the slide block carrying the middle and lower back rollers gives very flexible weighting pressure and is self-contained in that it moves with the weighted rollers as they are adjusted so that the direction of pull upon the weight hooks is always the same. It also centers the middle top rollers, preventing lateral or side creeping movement.

Instead of the weight book 35, as shown in Figure 1, I may employ other means for applying weight or pressure to one or more of the rollers. For example, in Figure 4 is illustrated a saddle comprising a bar 40 having portions restin on the rear roller 17 and the middle ro ler 15, and having hinged thereto as at 41 another bar 42, the forward end of which bears on the front roller 13. A weight hook '43 may engage the bar 42 in order to bring'pressure on all three of the upper, rollers and. it may, if desired, be used with a spring such as 36 shown in Figure 1. The bar 42 may preferably be provided with a In 44 having a set screw 45 extending theret rough, this set screw being located in such a manner as to bear against the front face of the cap 28. By means of a set screw 45, the position of the cap 28 on the roller 19 may be easily adjusted.

Figure 5 shows another type of pressureapplying means, this comprisin a bar 46, the rear end of which rests on t e rear top roller while the front end portion rests on the top middle roller 15. The front end ortion of the bar 46 is preferably extended orwardly with an upstanding finger 47 at the end thereof adapted to engage the front face of the cap 28 and thus to hold the cap in its position on the roller 19.

In Figure 6, the weight hook 50 is shown as hearing at its upper end on a bar 51, the forward end 52 of which is shaped to the bearing portion of the forward top roller 13 so as to hold it in fixed longitudinal position, and its rear end engages. the upper face of a bar 53 between the guide fingers 54 which hold it against lateral displacement. The forward end 55 of the bar 53 extends beneath the ca 28, and is provided with a cap retaining nger 56. It extends back on the top rollers 15 and 17 as shown. The weight hook thus weights all of the top rollers, adjustment of the position of the rear two rollers being permitted at the engagement of the bar 51 on the bar 53.

It will be noted that the direction of pull of the weighting hook causes the pressure exerted thereby between the rollers 15 and 16 to be materially greater than between the rollers 15 and 19. This causes the desired amount of pressure to be exerted between the drawing rollers 15 and 16 while permitting the fibers extending beyond the nip between these rollers to be drawn out between the rollers 15 and 19 without causing the yarn to become what is known in the trade as cockled or crackers.

In order to prevent undue local wear on the rollers, a traversing guide 48 may be provided in a manner well known in the art, the draft bar 26 being preferably arranged to be traversed with the guide 48. The cap 28, however, is preferably shorter than the rollers 15, 19 and is allowed to rest on the latter by its own weight. Thetraversing motion of the rovings or slivers passing through the slots 32 is suflicient to cause the cap 28 to traverse on the roller 19..

The roving or sliver entering the mechanism first passes the traversing guide 48 which is behind the rear rollers 17, 18, then passes through the nip of the rear rollers. It then passes to a slot 27 in the draft bar 26 where it is compacted to a certain extent and is retarded so that onl those fibers which are actually gripped y the ni of the middle rollers 15, 16 are pulled out rom the mass. After passing the nip of the middle rollers 15 and 16, it passes between the rollers 15 and 19 and continues about a portion of the periphery of the roller 19 under the cap 28. As it emerges from beneath the cap 28 through a slot 32, it is subjected to a second drawing operation bythe ni of the front rollers 13, 14 which seize the ers of which the rear ends are still under the retarding pinch between the cap and the surface of the roller 19 and draws them ahead of the other adjacent fibers in the roving. The slots 32 tend to compact the roving or sliver and to overcome a tendency of the rovings or slivers to spread laterally and splutter, particularly after the first drawing operation. The nip between the roller 19 and the surface 30 of the cap 28 may be suitably adjusted with reference to the nip of the front rollers 13, 14 by adjusting the block 12. This adjustment is necessary in addition to adjusting the draft bar 26 with reference to the nip of the middle rollers l5, 16. The support of the cap 28 is effected rather below its center in order that it may rest squarely and with practically its full weight on the roving.

Certain embodiments of this invention having thus been described, it should be evident to those skilled in the art that various changes and modifications might be made therein without departing from its spirit or scope as defined by the appended claims.

I claim:

1. A drawing mechanism comprising front and rear pairs of rollers, an intermediate set of rollers including an upper roller and forward and rear lower rollers engaging therewith, a draft bar adjustably located between the rear rollers and the intermediate set at a distance from the intermediate set about equal to the average length of the fibers of the roving or sliver being drawn, means for adjusting the distance between the front rollers and the forward lower intermediate roller, a cap having portions fitting on the surface of one of said intermediate lower rollers, and means for retaining said cap in place on top of said lower roller.

2. A drawing mechanism comprising front, intermediate, and rear pairs of rollers, a drawing roller between said front and intermediate pairs and engaging the upper intermediate roller, a cap having portions fitting on the surface of said drawing roller, and means for applying substantial weight to certain of said pairs of rollers, said means including means for retaining said cap in' place on top of said drawing roller and preventing the lateral movement of the roller itself.

3. A drawing mechanism comprising front, intermediate and rear pairs of rollers, a drawing roller between said front and intermediate pairs and with which the upper intermediate roller engages, a cap having portions fitting on the surface of said drawroller and anupwardly slotted plate-like projection extending downwardly in front of said roller, and means for retaining said cap on top of said drawing roller, said slot being in the path of a roving passing over said roller.

5. A drawing mechanism comprising pairs of front, rear and intermediate rollers, a drawing roller between said front and intermediate rollers and with which the top intermediate roller engages, a cap of substantial weight having a portion fitting on the surface of said drawing roller and extending toward the nip of said drawing roller with the top intermediate roller, and a pressureapplying member carried by the top intermediate roller, said member having a portion engaging the front face of said cap and holding said cap on said drawing roller close to but out of contact with the top intermediate roller.

6. As a new article of manufacture, a cap adapted to rest on one of the rollers of a drawing mechanism, said cap comprising a relatively heavy bar, a roller-engaging portion beneath said bar having an under surface shaped to fit on a drawing roller and merging into a plate-like portion adapted to extend forwardly and downwardly in front of said roller, said plate-like portion being provided with a slot extending upwardly from its lower edge substantially to said roller-fitting surface.

7. A drawing mechanism comprising a roller stand, a sliding block adjustably supported thereon, front, rear, and intermediate pairs of rollers, a drawing roller between the front and intermediate rollers and with which the top intermediate roller engages, a drawing member between said intermediate and rear rollers, adjustable toward and from said intermediate rollers, a cap on said drawing roller, and means for maintaining said cap on top of said drawing roller, said rear bottom roller, drawing member, memberadjusting means, intermediate rollers, drawtop iniielr-rmediate roller and said other drawm ro er.

In testimony whereof I have afiixed my ing roller and cap, all being carried by said sliding block and adjustably movable therewith toward and from the front rollers.

8. A drawing mechanism comprising front and rear pairs of drawing rollers, an intermediate set of rollers including two lower rollers and an upper roller engaging both of said lower rollers, a cap having a portion fitting on the surface of one of said lower rollers, and means for adjusting the distance of the cap from the top intermediate roller.

9. In a drawing mechanism, comprising front and rear pairs of drawing rollers, an

intermediate set of rollers including two lower rollers and an upper roller engaging both said lower rollers, said set of rollers being adjustable toward and from said front pair of rollers, and means movable as a unit with said set as it is adjusted for weighting said upper roller.

10. In a drawing mechanism comprising front and rear pairs of drawing rollers, an

. intermediate set of rollers including two lower rollers and an upper roller engaging both said lower rollers, a block for supporting said set of rollers and movable to adjust the spacing of said set of rollers from said front pair of rollers, and means carried by said block for weighting said upper rollers.

11. In a drawing mechanism comprising front and rear pairs of drawing rollers, an intermediate set of rollers including two lower rollers and an upper roller engaging both said lower rollers, a block for supporting said set of rollers and movable to adjust the spacing of said set of rollers from said front pair of rollers, a leaf spring fixed to said block and looped forwardly, a weight hook operativel engaging said upper roller and withv whic the forward end of said spring engages to thereby weight said upper roller, and means engaging the looped portion of said spring for adjusting the pressure applied thereby to said hook.

12. A drawing mechanism comprising a front pair of drawing rollers, a pair of drawing rollers back of said front pair, another drawing roller between said two pairs and against which the top roller of said pair engages, and means for applying pressure to said top roller in a direction to cause a materially greater pressure between said back pair of rollers than between said top roller and said other drawing roller.

13. A drawing mechanism com rising front, rear and intermediate pairs 0 drawing rollers, another drawing roller between said front and intermediate pairs and with which the top intermediate roller engages, and means for applying pressure to said top intermediate roller in a direction to cause materially greater pressure between said back intermediate rollers than between said signature. 

